Bridge bag bottom protection device

The utility model discloses a bridge bottom protection device which comprises a walking unit, a bearing unit and a hanging unit, the walking unit comprises a track and a propelling assembly, the bearing unit comprises a main frame and a bottom frame, the main frame is installed on the track in a sliding mode, a driving end of the propelling assembly is connected with the main frame, and a driving end of the bottom frame is connected with the hanging unit. The bottom frame is arranged below the main frame and connected with the main frame through the suspension unit, the working platform is installed on the bottom frame, the protection structure is installed on the edge of the working platform, and the bridge bottom-holding protection device does not need to be repeatedly erected and dismantled, so that the construction time is effectively shortened, and meanwhile the labor cost is reduced. 本实用新型公开了一种桥梁兜底保护装置，包括行走单元、承重单元与悬挂单元，所述行走单元包括轨道与推进组件，所述承重单元包括主框架与底框架，所述主框架可滑动地安装于所述轨道上，且所述推进组件的驱动端与所述主框架连接，所述底框架设置在所述主框架下方